#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc,char *argv[])
{
    if(argc!=2)
    {
        printf("can not execute!\n");
        exit(1);
    }

    printf("获取环境变量：%s\n",getenv("MY_VAL"));

    if(strcmp(argv[1],"-a")==0)
        printf("command a\n");
    else if(strcmp(argv[1],"-b")==0)
        printf("command b\n");
    else
        printf("default!\n");

    return 0;
}
